Jep we already did but for iframes. With the block plugin you can give an src URL and the plugin shows this as an template in domoboard !
But for YouTube it could be the same if we copy the block plugin and change the template to import an YouTube src

Just created an feature to add autologon functionality to domoboard.
If you get the latest develop update you can add autologon to the domoboard section in general settings and add True or False like this: